any boat yard or supply shop...their like 2"w x 6" L x 5/8" thick...get's screwed to the bottom of the hull then a ground wire goes from that to your fuse panel and all your gear is wired into that.....it's like the ground wire in your house that goes from your fuse panel to a rod that get's put into the ground....it suppose to give lighting somewhere to go in case you get hit..also give's you a better ground other than just using your battery.
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